Telephone-transmitter.



PATENTED JAN. 13, 1903.

' 0. 0. OADDEN.

TELEPHONE TRANSMITTER.

APPLICATION FILED SEPT. 8, 1902.

N0 MODEL.

Witnesses:

UNITED STATES PATENT OFFIC CHARLES C. CADDEN,'OF CLEVELANROHIO.

:TELEPHON'E-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 718,310, dated January 13, 1903. Application filed September 8, 1902. Serial 110.122.5 18; (to model.)

-a part of this specification.

My invention, relates to telephone-transmitters, and has for its object the provision of an improvedform of battery-transmitter employing comminuted carbon or equivalent material interposed between the electrodes.

The invention has for its particular object the provision of an improved form of casing or inclosnre fon the electrodes and for the comminuted material interposed between the electrodes, which is provided with improved structural adjuncts that will permit relative movement between the electrodes, so that the not to be responsive to the action of' soundwaves. Through one of these walls a stem is projected, which stem carries upon its inner end an electrode that is thus within the casing and which is clamped at its outer endto the main transmitter-diaphragm. The other v.wall of the chamber is preferably in the form of a threaded plate having threaded engagement with the annular wall of thecha nber, there being also provided in engagement with the annular wall of the chamber a distancepreserving ring, against which the threaded end wall may be screwed. This distancering maintains the required space between the electrodes, in which space the comminuted carbon is disposed.

In order that the electrode that is attached to the speaking-diaphragm may have relative movement with respect to the companion electrode, there is interposed between the electrode that is to be thus movable and the adjacent chamber-wall a yielding lining of fabric, which afiords a springy packing that serves to maintain the space between the in elevation.

movable electrode and the end wall through which the stem supporting the electrode is passed constantly filled toprevent the admission of the carbon particles to such space, u

this interposed cushion also constituting an insulation to prevent short-circuit between the electrodes. There is also interposed between the speaking-diaphragm and the end wall of the casing in immediate association with the movable electrode a spring-like-medium which serves to maintain the movable electrode in engagement with the cushion upon the interior of. the casing that separates the electrode fnom the said end wall.

' I will explain my invention more fully by.

reference to the accompanying drawings, in which- Figure 1 1s a rear view of the transmitter,

an inclosing casing being removed to reveal details of construction. Fig. '2' is a vertical sectional view through the axis of the transmitter-,portiohs of the structure being shown Fig. 3 isan enlarged sectional view of portions of the transmitter. Fig. 4 is a view of elements shown in Fig, 3 in separated relation. Fig. 5 is a view of the front of the chamber or casing. 4

Like parts are indicated by similar characters of reference throughout the different figures.

The general characteristics of the transmitter are'those frequently found in similar structures, there being provided a usual form of mouthpiece a, that is secured within the front plate b of the instrument, a cap 0 being provided upon the rear of the plate I) to inclose the transmitter parts. The plate bis provided with an annular recess in which is I disposed a rubber ringd,the ring beingfolded, as indicated, so that the speaking-diaphragm e may be contained between the folds. A

bridge-wall fis provided upon the plate I),

the front plate b, there is interposed between the diaphragm and the casing a-spring-like medium. .This spring-like medium is pref-- the required pressure, which pressure, how-' ever, is not snfiiciently great to overcome the action of sound-waves. The element offabric m delicately permits the movement of the diaphragm in consonance with the soundwaves.

The front electrode is preferably of a composite construction, it being formed of a metal disk 11, which supports a carbon plate or disk 0. The metal plate 11. is provided with a stem p, which passes through the wall It, through the fabricm, the spring I, and the speaking diaphragm e. The stem is shouldered, the large portion of the stem engaging the spring I, while the reduced portion isthreaded and passes through the spring I. and the dia-- phragm, a nut q serving to hold the stem, the diaphragm, and the spring in combination.

The rear electrode is also a. composite structore, the rear wall 11 constitutinga portion of Don disk 1-. V

- For the purpose of readily removing .the parts of the transmitter the end wall his preferably separately formed from the cylindrical wall g,- which cylindrical wall is provided with an annular lip at its front portion, upon the rear of which lip the end wall his engaged, there being provided a follower-ring s, which has threaded engagement with the annular wall of the casing for the purpose of maintaining the end wall in position. This follower-rings also acts as a distance-preserving means, forming ashoulder upon the interior of the cylindrical wall against which the wall 11 is screwed. By being threaded the ring s may act-as an adjustable distance-preservin g agency, who reby the distancebetween the electrodes may be varied. When the fol- .the electrode, which rear wall carries a carlower-ring is to act as an adjusting-ring to.

, minuted carbon the ring sis provided with trode without allowing'comminuted material to pass to the rear ofth'e front electrode.

While I have herein shown and particularly described the preferred embodiment oi! my invention, I do not wish to limit myself to the precise construction and arrangement herein shown; but,

Having thus described my invention, I

claim as new anddesire to secure by Letters Patent 1. In a transmitter, the combination with the speaking-diaphragm thereof, of an electrode attached thereto, anelectrode-chamber in which the said electrode is movable, and a yielding medium-interposed between the chamber and the speaking-diaphragm, substantially as described.

2. In a transmitter, the combination with the speaking-diaphragm thereof, of an electrode attached thereto, an electrode-chamber in which the said electrode is movable, and a yielding medium interposed between the chamber and the speaking-diaphragm, the said yielding medium .ginclnding a spring in engagement with the diaphragm and the chamber, substantially as described.

3. In a transmitter, the combination with the speaking-diaphragm thereof, 0! an electrode attached thereto, an electrode-chamber in which the said electrode is movable, and a yielding medium interposed between the chamber-and the-'spea king-diaphragnr aaid yielding medium including fabric in engagement with thechamber and the diaphragm, substantially as described. l a

{4. Ina transnijttenthe combination with the speaking-diaphragm thereof, of anelectrode attached thereto, an electrode-chamber in which the said electrode is movable, and

-a yielding medium interposed between the chamber and the speaking-diaphragm, said yielding'medium including a spring and tab ric for forming engagement between the diaphragm and the chamber, substantially as described.

5. In atransmitter, the combination with the speaking-diaphragm thereof, of an electrode attached thereto, an electrode-chamber in which the said] electrode is disposed, said electrode-chamber including a substantially rigid wall interposed between the electrode and the diaphragm, and a yieldingdistancepreserving mediumnpon the interior of the chamber interposed between the electrode and thesaid substantially rigid wall, substantially as described. 7 r h 6. In a transmitter, the combination with the speaking-diaphragm thereof, of 'an electransmitter-chamber oi electrodes: therein,

and the follower-ring'within the chamber serving by its adjustment to engage one of the electrodes-and thereby secure the adjustment of'the distance between this electrode and v containing the same, including an end wall separately formed, and an annular chamber, in the interior of which said end wall is disposed, said annular chamber being provided with a shoulder for'defining the position of said wall, said chamber also including an annular wall threaded upon its interior, a follower-ring having threaded engagement with the annular wall serving 'to clamp the said end wall in place, and a threaded platei having engagement with the annular wall and limited in its movement by the follower-ring, the said threaded plate carrying an electrode, substantially as described. p

In witness whereof I have hereunto subscribed my name this 4th day of Septembe-r -CHARLES o. OAEDDEN.

' Witnesses: v

V E. G. GAYLORD, N. CANTILLON. 

